Issue #614 Avoid tags plugin in Trac being reinstalled every provision time.

modules/trac/manifests/init.pp

 class trac(
     $domain,
     $certificate,
     $private_key,
     $is_default = false) inherits private::trac {
   package {['python-mysqldb','python-pip','subversion', 'tofrodos', 'graphviz']:
     ensure => present
   }
 
   include nginx, spawn-fcgi
@@ skipping 110 matching lines @@
   file {"/home/trac/environment/conf/trac.ini":
     ensure => present,
     content => template('trac/trac.ini.erb'),
     owner => trac,
     require => Exec['trac_env']
   }
 
   exec { 'install_Tractags':
     command => "pip install svn+http://trac-hacks.org/svn/tagsplugin/tags/0.7/",
     require => Package['python-pip'],
-    unless => "python -c 'import tagsplugin'",
+    unless => "python -c 'import tractags'",
   }
 
   file {"/home/trac/htdocs/htdocs/common/adblockplus_logo.png":
     ensure => present,
     source => 'puppet:///modules/trac/adblockplus_logo.png',
     owner => trac,
     require => Exec['deploy']
   }
 
   file {"/home/trac/environment/htdocs/theme.css":
@@ skipping 38 matching lines @@
     require => Exec['deploy'],
   }
 
   file {"/home/trac/permissions.csv":
     ensure => present,
     owner => trac,
     source => 'puppet:///modules/trac/permissions.csv'
   }
 
 }